A gis-based method for estimating the amount of silt held in check dams

Abstract

The invention discloses a method for estimating the silt interception amount of a silt dam based on a GIS, belonging to the field of analysis of digital terrains. In the invention, an obtained GIS image is converted into a lattice matrix; the position data of a simple interception-free river network model and the position data of the silt dam are determined according to data in the lattice matrix; then, the position data of the silt dam is corrected; therefore, the silt dam is expanded, such that an expanded silt dam is obtained; the storage capacity of the expanded silt dam is obtained based on the flow direction of a dam point in the expanded silt dam; and, with the help of the storage capacity, the silt interception amount of the expanded silt dam is finally obtained. According to the invention, the silt dam is expanded, such that the expanded silt dam according with practical conditions better is obtained; the condition that the practical calculation result can be influenced due to the fact that the silt dam only occupies one lattice in the GIS image can be avoided; furthermore, calculation of the silt interception amount is carried out in a manner of using the data in the GIS image; therefore, influence of the factors, such as the size of the deposition surface gradient, the gully slope, the shape and the deposited particle diameter, can be avoided; and thus, the calculation accuracy of the silt interception amount is ensured.

Description

technical field [0001] The invention belongs to the field of digital terrain analysis, and in particular relates to a GIS-based method for estimating the silting volume of a check dam. Background technique [0002] Warping dams refer to channel treatment engineering facilities built in sediment-rich channels to control channel erosion and silt, and at the same time reduce floods and sediment disasters as the main goal. [0003] There is no accurate, reliable, simple and practical method for how to determine the amount of sediment retained by a check dam in a large-scale check dam investigation. There are two difficulties in the amount of sediment retained by check dams: first, the volume of check dams is large and the area is wide. Most of them are built by the masses themselves. There is no actual measurement data of the original channel. After the dam is silted up, the shape parameters of the original channel cannot be obtained, and the boundary of the silt body is unclea...

AI Technical Summary

Problems solved by technology

[0005] Since the slope of the silt surface is related to the gradient, shape, and particle size of the silt, it is impossible to accurately determine the amount of sediment retained by the check dam

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